题目内容
(1)计算:
-(
+
)÷
(2)解方程:
x+
x=4.4.
9 |
10 |
1 |
4 |
7 |
20 |
3 |
4 |
(2)解方程:
1 |
2 |
3 |
5 |
分析:(1)先算括号里面的,再算括号外面的除法,最后算减法.
(2)先化简,再根据等式的基本性质,在方程两边同时乘
.据此解答.
(2)先化简,再根据等式的基本性质,在方程两边同时乘
10 |
11 |
解答:解:(1)
-(
+
)÷
,
=
-
÷
,
=
-
,
=
;
(2)
x+
x=4.4,
x=4.4,
x×
=4.4×
,
x=4.
9 |
10 |
1 |
4 |
7 |
20 |
3 |
4 |
=
9 |
10 |
3 |
5 |
3 |
4 |
=
9 |
10 |
4 |
5 |
=
1 |
10 |
(2)
1 |
2 |
3 |
5 |
11 |
10 |
11 |
10 |
10 |
11 |
10 |
11 |
x=4.
点评:本题主要考查四则运算和解方程的能力.注意要认真细心.
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